M. Stock

Persistence of the insecticide dimethoate in three different soils under laboratory conditions.

The present stuctures have been undertaken to investigate the persistence of dimethoate in 3 different soils without leaching at 10°C and 20°C

Degradation of Glyphosate in Excised Leaves of Tobacco and Sugar Beet

Summary Leaves of tobacco (Nicotiana tabacum) and sugar beet (Beta vulgaris) were treated with glyphosate [14C]-labelled in positions C1, C2 or C3 for investigation of biodegradation of this herbicide in higher plants. After treatment for 48 hours radioactivity was found as [14C]CO2 in the soluble fraction (e.g. undegraded glyphosate and aminomethylphosphonic acid) and in non-extractable material (cell wall constituents, proteins etc.). The results indicate metabolic capacity of leaves to detoxify glyphosate by decarboxylation.

Metabolism of amitrole in apple: I. Soluble metabolites from mature fruits

Abstract Mature fruits from apple trees contain residual amounts of radiolabel derived from soil-ap- plied [3,5-14C]amitrole. This report deals with characterization of the soluble part of this radioactivity. By GC/MS of suitable derivatives 3-(1,2,4-triazol-1-yl)-2-aminopropionic acid was identified as a new metabolite of amitrole. Significant parts of radiolabel were incorporated into genuine plant products, indicating liberation of 14CO2 from the applied substance followed by reassimilation. Possible pathways of metabolism of amitrole within the system soil/apple tree are discussed.

Synthese von radioaktiv markierten Pestiziden und deren Anwendung für Untersuchungen von Metabolismus und Verhalten in Pflanzen und im Boden

An einigen Beispielen aus dem Isotopenlabor des Institutes fur Biochemie der Pflanzen Halle werden Moglichkeiten und Arbeitsweisen bei der Synthese von Kohlenstoff-14- und Tritium-markierten Agrochemikalien und Zwischenprodukten sowie deren Anwendung bei der Untersuchung von Metabolismus und Verhalten in pflanzlichen Systemen und im Boden behandelt. Dabei wird z. T. auch Originalliteratur einbezogen sowie auf Ubersichtsarbeiten auf diesem Gebiet hingewiesen. With some examples from the Isotopic Laboratory of the Institute of Plant Biochemistry Halle the possibilities and approaches of syntheses of agrochemicals and intermediates labelled with carbon-14 and tritium as well as their use to study the metabolism and behaviour in plant systems and in soils are discussed. Original references are included and related reviews in this field are cited.